Solve the problem.An exterminator activates an aerosol "fogger" in a large auditorium. The concentration of insecticide immediately afterwards can be modeled by the function C(x, y, z) = -0.0001 ln
,where x, y, and z are measured in feet from a particular floor-level corner of the room. To escape the insecticide, a flying insect located at 
needs to fly immediately in the direction of greatest decrease in concentration. Find the unit vector indicating the direction the insect should fly.
A. u = 
B. u = 
C. u = 
D. u = 
Answer: C
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 8x2, y = 8
A. 
?
B. 96?
C. 
?
D. 
?
A metal bar is heated and then placed on a workbench for bending. The temperature B, in degrees Fahrenheit, t minutes after heat is applied is given by
.
?
The bar can be worked so long as its temperature is higher than 440 degrees. For what values of t is the bar suitable for working? Round your answer to two decimal places.
?
A. 
minutes
B. 
minutes
C. 
minutes
D. 
minutes
Write an equation for the graph of the sine or cosine curve.
A. y = 3 cos 
B. y = 3 cos 
C. y = 3 cos 
D. y = 3 cos 
Use the periodic compound interest formula to solve the problem.Find the amount in a savings account at the end of 8 years if the amount originally deposited is $8000 and the interest rate is 7% compounded monthly. Round to the nearest cent.
A. $8381.05 B. $13,982.61 C. $772,480.00 D. $15,380.87